RDMA/uverbs: Push out CQ buffer umem processing into a helper

Extract the UVERBS_ATTR_CREATE_CQ_BUFFER_* parser from the CQ
create handler into uverbs_create_cq_get_buffer_desc(), and wrap
it in ib_umem_get_cq_tmp(), the umem-producing helper the cq_create
handler now calls.

ib_umem_get_cq_tmp() is temporary; subsequent patches replace it
with driver-owned ib_umem_get_cq_buf*() wrappers built on the
same parser, and remove it once all CQ drivers have switched.

Link: https://patch.msgid.link/r/20260529134312.2836341-6-jiri@resnulli.us
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

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